Long Range Correlations in the Disordered Phase of a Simple Three State Lattice Gas

Details Long Range Correlations in the Disordered Phase of a Simple Three State Lattice Gas Long Range Correlations in the Disordered Phase of a Simple Three State Lattice Gas

1996-12-11

arxiv.org/abs/cond-mat/9612109v2

Physica A 239, 111 (1997)

Physics

Condensed Matter

Statistical Mechanics

7 RevTeX pages, 1 postscript figure included

Scientific paper

We investigate the dynamics of a three-state stochastic lattice gas, consisting of holes and two oppositely "charged" species of particles, under the influence of an "electric" field, at zero total charge. Interacting only through an excluded volume constraint, particles can hop to nearest neighbour empty sites. With increasing density and drive, the system orders into a charge-segregated state. Using a combination of Langevin equations and Monte Carlo simulations, we study the steady-state structure factors in the disordered phase where homogeneous configurations are stable against small harmonic perturbations. They show a discontinuity singularity at the origin which in real space leads to an intricate crossover between power laws of different kinds.

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